So apparently the image for 1893 (de-sb893.gif) is incorrect in that it misses the arms. However, I would find more logical a co-existance of Landesfarben (with no arms) and Landesflagge (with arms), throughout 1832-1918, with varying order of stripes. In that case we would have:

Civil Flag 1832-c.1893 and late 1890's-1918Landesfarben

Horizontal bicolor white-green. In use until 1918.Norman Martin, March 1998

In 1832 a green-white flag was adopted. Toward 1893 the flag became white-green with the coat of arms and was declared National flag. Shortly later it was again used green over white until 1918.Mario Fabretto, 31 August 1998

Civil Flag c.1893-late 1890'sLandesfarben

State Flag 1826-1918Landesflagge

Horizontal bicolor green-white with crowned Saxon arms at center. In use until 1918.Norman Martin, March 1998

Duke's Standard 1826-1909Herzogsstandarte

Image
by Jaume Ollé

White flag with crowned Saxon arms and supporters at center. In use until 1918.Norman Martin, March 1998

The small pennons were white-green from 1893, previously green-white. This standard was in use until 1909; later was adopted one with eight white and green stripes with the Saxon device in the canton (1:1).Mario Fabretto, 31 August 1998

Duke's Standard 1909-1918Herzogsstandarte

According to Norman Martin, the 1909-1918 standard had...eight stripes white-green, and a square canton which was a banner of the Saxon arms (10 stripes black-yellow and a green crancelin).Santiago Dotor, 8 February 2001